Add Python 3.12

[Dreamsorcerer]

Blocked by pytest-dev/pytest-forked#67

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (38c22c7) 91.28% compared to head (c136045) 89.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #623      +/-   ##
==========================================
- Coverage   91.28%   89.93%   -1.35%     
==========================================
  Files          12       12              
  Lines         815      815              
  Branches      140      111      -29     
==========================================
- Hits          744      733      -11     
- Misses         47       57      +10     
- Partials       24       25       +1     

Flag	Coverage Δ
unit	89.93% <ø> (-1.23%)	⬇️

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